US10485195B2 - Sorghum plants having a mutant polynucleotide encoding the large subunit of mutated acetohydroxyacid synthase protein and increased resistance to herbicides - Google Patents

Sorghum plants having a mutant polynucleotide encoding the large subunit of mutated acetohydroxyacid synthase protein and increased resistance to herbicides Download PDF

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US10485195B2
US10485195B2 US13/822,276 US201213822276A US10485195B2 US 10485195 B2 US10485195 B2 US 10485195B2 US 201213822276 A US201213822276 A US 201213822276A US 10485195 B2 US10485195 B2 US 10485195B2
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sorghum
plant
plants
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herbicide
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Vicente Trucillo Uriarte
Andrés Daniel Zambelll
Marcos Kaspar
Pedro Alejandro Pardo
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Advanta Holdings BV
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01H—NEW PLANTS OR NON-TRANSGENIC PROCESSES FOR OBTAINING THEM; PLANT REPRODUCTION BY TISSUE CULTURE TECHNIQUES
    • A01H5/00—Angiosperms, i.e. flowering plants, characterised by their plant parts; Angiosperms characterised otherwise than by their botanic taxonomy
    • A01H5/10—Seeds
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01H—NEW PLANTS OR NON-TRANSGENIC PROCESSES FOR OBTAINING THEM; PLANT REPRODUCTION BY TISSUE CULTURE TECHNIQUES
    • A01H5/00—Angiosperms, i.e. flowering plants, characterised by their plant parts; Angiosperms characterised otherwise than by their botanic taxonomy
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01H—NEW PLANTS OR NON-TRANSGENIC PROCESSES FOR OBTAINING THEM; PLANT REPRODUCTION BY TISSUE CULTURE TECHNIQUES
    • A01H6/00—Angiosperms, i.e. flowering plants, characterised by their botanic taxonomy
    • A01H6/46—Gramineae or Poaceae, e.g. ryegrass, rice, wheat or maize
    • A01H6/4666—Sorghum, e.g. sudangrass
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
    • C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
    • C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
    • C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
    • C12N15/8261—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield
    • C12N15/8271—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance
    • C12N15/8274—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance for herbicide resistance
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
    • C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
    • C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
    • C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
    • C12N15/8261—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield
    • C12N15/8271—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance
    • C12N15/8274—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance for herbicide resistance
    • C12N15/8278—Sulfonylurea
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/10—Transferases (2.)
    • C12N9/1022—Transferases (2.) transferring aldehyde or ketonic groups (2.2)
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/88—Lyases (4.)
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
    • C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
    • C12Q1/6876—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
    • C12Q1/6888—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for detection or identification of organisms
    • C12Q1/6895—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for detection or identification of organisms for plants, fungi or algae
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Y—ENZYMES
    • C12Y202/00—Transferases transferring aldehyde or ketonic groups (2.2)
    • C12Y202/01—Transketolases and transaldolases (2.2.1)
    • C12Y202/01006—Acetolactate synthase (2.2.1.6)
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q2600/00—Oligonucleotides characterized by their use
    • C12Q2600/156—Polymorphic or mutational markers

Definitions

  • Sorghum Sorghum spp.
  • Sorghum spp. is a plant genus comprising approximately 20 species of grasses. It is native to tropical and subtropical regions of East Africa and it is grown in every continent for grain for human and animal consumption, being also used as fodder, and for manufacturing alcoholic beverages. As it is gluten-free, sorghum is suitable for individuals suffering from celiac disease.
  • Sorghum is more tolerant to drought and excess soil moisture content than most cereals. It is capable of growing properly under varied soil and weather conditions. Likewise, it responds favorably to irrigation, requiring a minimum of 250 mm during its life cycle, with an optimum irrigation ranging from 400-550 mm.
  • the soil must have an appropriate moisture content at the time of planting in order to achieve a rapid and homogeneous emergence and thereby a good crop implantation.
  • the greatest demand of water starts 30 days after emergence and continues until grains are filled, the most critical stages being those of panicle formation and flowering, as water deficiency at this time will result in decreasing yields.
  • sorghum has the ability of remaining dormant during periods of drought and resumes growth under favorable periods, although these stress situations may affect performance.
  • Sorghum requires high temperatures for normal development, and consequently it is more sensitive to low temperatures than other crops.
  • a soil temperature of not less than 18° C. is required for germination; and actual active growth of the plant is not achieved until a temperature of 15° C. is reached, the optimum temperature being of about 32° C.
  • Acetohydroxyacid synthase is the first enzyme which catalyzes the synthesis of branched amino acids valine, leucine and isoleucine.
  • AHAS is the target of some herbicides such as sulfonylureas, imidazolinones, triazolopyrimidines and pyrimidyloxybenzoates.
  • the two former herbicide families are widely used in modern agriculture due to their low toxicity and high efficacy against weeds.
  • the imidazolinone family of herbicides comprises imazethapyr, imazaquin, and imazapyr.
  • Some sulfonylureas present in the market are: metsulfuron-methyl, chlorosulfuron, nicosulfuron, cinosulfuron, imidasulfuron, halosulfuron, rimsulfuron, trisulfuron-methyl, and tribenuron-methyl.
  • plants which are resistant to herbicides of the imidazolinone and/or sulfonylurea families for example, species such as Zea mays, Arabidopsis thaliana, Brassica napus, Glycine max, Nicotiana tabacum , and Oryza sativa (Sebastian et al., (1989) Crop Sci., 29: 1403-1408; Swanson et al., 1989 Theor. Appl. Genet. 78: 525-530; Newhouse et al., (1991) Theor. Appl.
  • Plants resistant to herbicides of the imidazolinone or sulfonylurea type have also been detected. These plants have acquired resistance naturally and have been used for cross-breeding, resulting in herbicide-resistant varieties. From the analysis of resistant plants, a point mutation was determined in the AHAS protein of sunflower resulting in the substitution of the amino acid Ala by Val (White et al., (2003) Weed Sci., 51: 845-853).
  • U.S. Pat. Nos. 4,761,373; 5,331,107; 5,304,732; 6,211,438; 6,211,439; and 6,222,100 disclose plants resistant to imidazolinone herbicides. All these patents generally describe the use of an altered AHAS gene to elicit herbicide resistance in plants, and specifically disclose certain imidazolinone resistant corn lines.
  • U.S. Pat. Nos. 5,731,180 and 5,767,361 discuss an isolated gene having a single amino acid substitution in a wild-type monocot AHAS amino acid sequence that results in imidazolinone-specific resistance.
  • Patent documents WO 2006/007373 and WO 2006/060634 disclose mutations conferring resistance to herbicides of the imidazolinone type in wheat plants.
  • Patent document U.S. 20100115663 refers to herbicide-resistant sorghum plants achieved by altering acetyl CoA carboxylase genes. Also disclosed are sorghum plants resistant to the herbicide dinitroaniline (U.S. 20100205686) and sorghum plants resistant to the herbicide acetolactate synthase (WO 2008/073800).
  • the sorghum plants of the present invention show improved resistance to herbicides, for example herbicides targeting the AHAS enzyme, i.a., imidazolinones and sulfonylureas, as compared to wild-type sorghum plants.
  • the sorghum plant ( Sorghum bicolor ) of the present invention comprises in its genome at least one polynucleotide.
  • Said polynucleotide encodes a large subunit of AHAS having an alanine to threonine substitution at position 93 of the large subunit of sorghum AHAS or an equivalent position, wherein said plant has increased resistance to one or more herbicides, such as herbicides selected from the group of imidazolinones, as compared to wild-type sorghum plants.
  • the sorghum plant may comprise in its genome, one, two, three or more copies of a polynucleotide encoding a mutated large subunit of sorghum AHAS or a sorghum AHAS polypeptide of the invention.
  • the sorghum plant may be tolerant to any herbicide capable of inhibiting AHAS enzyme activity, i.e., the sorghum plant may be tolerant to herbicides of the imidazolinone type, such as, without limitation, imazethapyr, imazapir, and imazapic or to herbicides of the group of sulfonylureas, such as, without limitation, chlorosulfuron, metsulfuron methyl, sulfometuron methyl, chlorimuron ethyl, thiofensulfuron methyl, tribenuron methyl, bensulfuron methyl, nicosulfuron, ethametsulfuron methyl, rimsulfuron, triflusulfuron methyl, triasulfuron, primisulfuron methyl, cinosulfuron, amidosulfuron, fluzasulfuron, imazosulfuron, pyrazosulfuron eth
  • the sorghum plant of the invention which is resistant to herbicides belonging to the group of imidazolinones or sulfonylureas is the sorghum line designated VT11-11331-BK which seeds were deposited with the NCIMB collection under Access No. NCIMB 41870, on Oct. 12, 2011, under the terms of the Budapest Treaty.
  • the mutated VT11-11331-BK plant, parts thereof and its seeds comprise in their genome the mutated AHAS gene comprising a polynucleotide having the nucleotide sequence set forth in SEQ ID No. 1 encoding the polypeptide or AHAS large subunit having the sequence set forth in SEQ ID No. 2.
  • amino acid sequence of SEQ ID No. 2 corresponding to the large subunit of AHAS differs in one amino acid from the wild-type amino acid sequence of the large subunit of sorghum AHAS (SEQ ID No. 3), said difference comprising an alanine to threonine substitution at position 93 of the large subunit of sorghum AHAS, or equivalent positions.
  • the herbicide-tolerant sorghum plant germoplasm of the invention is useful for introducing the tolerance trait by introgression into other Sorghum varieties.
  • the sorghum plants of the present invention include progeny and seeds of plants comprising a polynucleotide, where said polynucleotide encodes an AHAS large subunit and has an alanine to threonine substitution at position 93 of said large subunit of sorghum AHAS or at an equivalent position, wherein said plant shows an increased resistance to one or more imidazolinone and/or sulfonylurea herbicides as compared to wild-type sorghum plants.
  • the herbicide-resistant sorghum plant comprises the resistance traits of NCIMB 41870, and may be a plant as described in NCIMB 41870, a progeny of an NCIMB 41870 plant, a mutant of an NCIMB 41870 plant, and a progeny of an NCIMB 41870 mutant.
  • the plant may be transgenic or non-transgenic and belong to any plant species suitable for agronomical use, or for other uses, such as ornamentals.
  • a sorghum seed comprising in its genome at least one polynucleotide, wherein said polynucleotide encodes a polypeptide having an alanine to threonine substitution at position 93 of the sorghum AHAS protein large subunit.
  • the seed germinates and produces a plant having increased resistance to one or more herbicides of the imidazolinone group as compared to wild-type sorghum plants.
  • said seed is the seed deposited as NCIMB 41870.
  • a method for identifying a plant resistant to herbicides from the group of imidazolinones or sulfonylureas comprising:
  • plants comprising at least one mutation in AHAS such as the mutation in NCIMB 41870 are selected, where said at least one mutation in the AHAS gene encodes a polypeptide or large subunit of AHAS comprising a Ala93Thr substitution as compared to the wild-type sorghum AHAS amino acid sequence.
  • the plant may be a monocot or a dicot.
  • the plant is a plant of agronomic interest, such as sorghum, rice, corn, soybean, wheat, oat, barley, rye, flax, cotton, sugarcane, sunflower, or the like.
  • the method of identification may employ a specific point mutation SNP marker.
  • the present invention provides a method for controlling weeds in the near proximity of agronomic plants, for example sorghum plants, where said sorghum plants are resistant to herbicides, such as herbicides from the group of imidazolinones and/or sulfonylureas.
  • the herbicide is an imidazolinone.
  • the imidazolinone herbicide may be imazethapyr, imazapic, or imazapyr.
  • the plant may exhibit resistance traits such as NCIMB 41870, and it may be a derivative, mutant, or progeny plant thereof.
  • the present invention provides a polypeptide comprising, without limitation, one or more of the following nucleotide sequences:
  • polynucleotide encodes a polypeptide of the large unit of AHAS comprising an Ala93Thr substitution.
  • the present invention also provides an expression cassette comprising at least one polynucleotide having the following nucleotide sequence: SEQ ID No. 1, a nucleotide sequence encoding the polypeptide set forth in SEQ ID No. 2, a nucleotide sequence encoding a polypeptide having at least 95% sequence identity to amino acid sequence SEQ ID No. 2, wherein the polypeptide exhibits herbicide-resistant AHAS activity; a nucleotide sequence having at least 85% identity to the nucleotide sequence set forth in SEQ ID No. 1, wherein the nucleotide sequence encodes a polypeptide comprising a large subunit of AHAS and exhibits herbicide-resistant AHAS activity, or complementary sequences thereof.
  • the polynucleotide encodes a polypeptide of the large unit of AHAS comprising an Ala93Thr substitution; said sequences being operably linked to a nucleotide sequence for conducting expression, for example one or more promoters, enhancers or other known regulatory sequences.
  • the promoter may be a promoter for expression in plants, plant tissues, chloroplasts, animal, bacterial, fungal or yeast cells.
  • the present invention provides a transformation vector comprising at least one polynucleotide having one of the following nucleotide sequences: a) the nucleotide sequence set forth in SEQ ID No. 1, b) a nucleotide sequence encoding the polypeptide set forth in SEQ ID No.
  • nucleotide sequence encoding a polypeptide having at least 95% sequence identity to the amino acid sequence of SEQ ID No:2, where the polypeptide exhibits herbicide-resistant AHAS activity
  • a nucleotide sequence having at least 85% identity to the nucleotide sequence set forth in SEQ ID No:1 where the nucleotide sequence encodes a polypeptide comprising a large subunit of AHAS and exhibits herbicide-resistant AHAS activity; further comprising operably linked sequences driving the expression of the nucleotide sequence and selectable markers.
  • the vector may be used for transforming bacteria, fungi, yeasts, plant cells or animal cells, being adapted for each particular case.
  • the present invention provides a transformed plant comprising, integrated in its genome, at least one promoter operably linked to a polynucleotide selected from: a) the nucleotide sequence set forth in SEQ ID No. 1, b) a nucleotide sequence encoding the polypeptide set forth in SEQ ID No. 2; c) a nucleotide sequence encoding a polypeptide having at least 95% sequence identity to amino acid sequence SEQ ID No. 2, where the polypeptide exhibits herbicide-resistant AHAS activity; d) a nucleotide sequence having at least 85% identity to the nucleotide sequence set forth in SEQ ID No.
  • nucleotide sequence encodes a polypeptide comprising a large subunit of AHAS and having herbicide-resistant AHAS activity; e) a nucleotide sequence fully complementary to one of nucleotide sequences a) to (d), where the vector further comprises a selectable gene and at least one promoter operably linked to a nucleotide sequence that drives the expression of said nucleotide sequence.
  • the promoter is a promoter driving polypeptide expression in plants, for example in plant tissues or chloroplasts.
  • the transformed plants may be monocots, for example sorghum, corn, rice, or wheat; or dicots, for example sunflower, Arabidopsis , tobacco or oilseed rape.
  • the transformed plant is resistant to herbicides (imidazolinones and sulfonylureas) over the same wild-type plant when equal amounts of said herbicides are applied to both.
  • the invention also provides a method for obtaining a herbicide-resistant plant or a plant having increased resistance to a herbicide, said method comprising the steps of i) transforming a plant cell with an expression cassette comprising a polynucleotide ii) regenerating the plant cell to obtain a herbicide-resistant plant, said polynucleotide having at least one of the following nucleotide sequences: a) the nucleotide sequence set forth in SEQ ID No. 1, b) a nucleotide sequence encoding the polypeptide set forth in SEQ ID No. 2, c) a nucleotide sequence encoding a polypeptide having at least 95% sequence identity to amino acid sequence SEQ ID No.
  • the DNA expression cassette comprises at least one promoter for driving the expression of the polypeptide in plants, for example in plant tissues or chloroplasts.
  • the transformed plants may be monocots, for example sorghum, corn, rice or wheat; or dicots, for example sunflower, Arabidopsis , tobacco, soybean, or oilseed rape.
  • the transformed plant is resistant to herbicides (imidazolinones and sulfonylureas) as compared to the wild-type plant when equal amounts of said herbicides are applied to both.
  • the plant comprises the large subunit of AHAS resistant to herbicides.
  • FIG. 1 shows dose-response curves of the imidazolinone-resistant mutant sorghum line (ADV-IMI-R) and the original endogamic sorghum line 80237 or wild-type line.
  • Assayed herbicides were: imazethapyr, imazapyr and imazapic at rates of 0 (control), 1 ⁇ , 2 ⁇ , 3 ⁇ , and 4 ⁇ .
  • Herbicidal effect was measured as a percentage of dry matter (DM) of aerial tissues as compared to an untreated control; each value being the average of three assays.
  • FIG. 2 shows the alignment of mutant ADV-IMI-R AHAS nucleotide sequences and those of the original endogamic sorghum line 80237 or wild-type line. G to A substitution of nucleotides is indicated at position +277, which distinguishes both sequences.
  • the different primers used for amplifying overlapping amplicon sequences are underlined (ADV-IMI-R, SEQ ID NO: 36; 80237, SEQ ID NO: 35).
  • FIG. 3 shows genotyping assays for a SNP G/A at codon 93 of sorghum AHAS gene.
  • the specific SNP-SbAHAS marker was analyzed in the genotype of 177 F2 progeny plants from ADV-IMI-R ⁇ F2 90523.
  • Three clusters were clearly defined and identified as dots (•) corresponding to homozygous plants for the mutant allele (A/A), triangles ( ⁇ ) corresponding to heterozygous plants (A/G) and diamonds ( ⁇ ) for homozygous plants of the wild-type allele (G/G).
  • FIG. 4 shows the results obtained by matching the nucleotide sequence of the sorghum AHAS gene (Access No. GM663363.1) with sorghum genomic sequences ( Sorghum bicolor ) deposited with the Phytozome nucleotide sequence database (http://www.phytozome.net/search.php).
  • endogamic sorghum ( Sorghum bicolor ) line 80237 plants were treated with an aqueous solution of ethyl methanesulfonate (EMS). Treated seeds were planted and left for open pollination. Two hundred and seventy three M1 plants were selected and two seeds of each plant were planted in a nursery, thereby obtaining a total of 546 M2 plants. Pollen from one plant of each pair was collected and used for pollinating the other plant of the pair. M3 seeds obtained from each of the 273 pollinated M2 plants were harvested. A total of 273 furrows were planted with the M3 progeny.
  • EMS ethyl methanesulfonate
  • ADV-IMI-R Herbicide-tolerant M7 mutant plants and seeds selected from the original ADV-IMI-R mutant (designated VT11-11331-BK) were obtained and deposited with the NCIMB collection with Access No. NCIMB 41870, under the terms of the Budapest Treaty, on Oct. 12, 2011.
  • the present invention is not limited to sorghum plants mutated with EMS.
  • sorghum plants obtained by other mutation methods, for example methods such as radiation and chemical mutagens.
  • Herbicide-resistant mutant plants can also be obtained by means of a process of selective pressure on cells cultured with a herbicide and selection of resistant cells to generate a herbicide-resistant plant. Details of mutation and breeding methods can be found in “Principles of Cultivar Development” Fehr, 1993, Macmillan Publishing Company, the disclosure of which is included herein by reference.
  • the response of the ADV-IMI-R mutant of the invention was compared to that of endogamic line 80237.
  • Table 2 shows the effect of different rates of imazethapyr, imazapyr, and imazapic expressed as a percentage of dry matter as compared to he tuntreated control (DM % Control). The disclosed values are the average of three experiments.
  • the herbicide-resistant sorghum plant of the present invention is resistant to herbicides of the imidazolinone group, such as, imazethapyr, imazapic, or imazapyr.
  • the imidazolinone-resistant sorghum plants may be sprayed with amounts which are 4 times the recommended amounts of use of any of the group of known imidazolinone herbicides.
  • the resistant plant may have, for example, the resistance traits as observed in plants from NCIMB 41870 seeds, or it may be a plant derived therefrom, a progeny, or other plants comprising in their genome at least one polynucleotide encoding a polypeptide having an alanine to threonine substitution at position 93 of the sorghum AHAS protein or at an equivalent position, said plant having increased resistance to one or more herbicides from the imidazolinone group as compared to wild-type sorghum plants.
  • amino acid positions can vary depending on whether amino acids are added or removed, e.g., from the N-terminal end of an amino acid sequence.
  • amino acid positions can vary depending on whether amino acids are added or removed, e.g., from the N-terminal end of an amino acid sequence.
  • equivalent position it is intended to mean a position that is within the same conserved region as the exemplified amino acid position.
  • tolerant to a herbicide and “resistant” to a herbicide have the same meaning and an equivalent scope when used in relation to herbicides such as imidazolinones or sulfonylureas.
  • the present invention provides plants, plant cells, plant tissues showing resistance to effective amounts of herbicides.
  • effective amounts is meant amounts of herbicide capable of inhibiting the growth of wild-type plants, plant cells or tissues but which do not produce severe effects on resistant plants, plant cells or plant tissues.
  • An effective amount of a herbicide is the recommended amount for eliminating weeds.
  • a wild-type plant, cell or tissue is one that does not exhibit herbicide resistance traits, for example a herbicide belonging to the group of imidazolinones or sulfonylureas.
  • plant encompasses a plant in any stage, or plant parts, where said plant parts may be seeds, leaves, flowers, stems, tissues or organs, well known to a skilled botanist.
  • the mutated sorghum AHAS gene of the invention which encodes a polypeptide having acetohydroxyacid synthase activity was sequenced, wherein said AHAS polypeptide or large subunit is herbicide-resistant.
  • a comparison of the AHAS gene DNA sequence from mutated plants with the AHAS gene DNA sequences from wild-type sorghum plants identified a point mutation by which a G nucleotide at nucleotide position +277 changes into A, which distinguishes the original sorghum 80237 line (wild-type) from the ADV-IMI-R mutant of the invention.
  • AHAS amino acid sequences from mutant and wild-type lines were deduced it was observed that the nucleotide substitution (GCG by ACG of SEQ ID No. 1) encoded a mutated polypeptide at codon 93 and produced an alanine to threonine(Ala93Thr) substitution in the polypeptide (SEQ ID No. 2) exhibiting acetohydroxyacid synthase activity and corresponds to the large subunit of sorghum AHAS protein of the mutated ADV-IMI-R line.
  • plants, plant parts, seeds, progeny thereof, transgenic plants or the like comprising a polynucleotide encoding a polypeptide having an alanine-to-threonine (Ala93Thr) substitution at position 93 of said polypeptide or at an equivalent position of another AHAS enzyme belonging to different species.
  • alanine-to-threonine Al93Thr
  • sequence identity percent is determined by alignment of two amino acid sequences or two nucleotide sequences. Alignment percentage between two sequences may be calculated, for example, using the following formula: (amount of identical positions/total amount of overlapping positions) ⁇ 100
  • Alignment percentage between two sequences is determined using different mathematical algorithms, for example, the algorithms included in the NBLAST and XBLAST programs of Altschul et al., (1990) J. Mol. Biol. 215: 403.
  • the default parameters of the respective programs e.g., XBLAST and NBLAST
  • Another preferred, non-limiting example of a mathematical algorithm utilized for the comparison of sequences is the algorithm of Myers and Miller (1988) CABIOS 4:11-17.
  • Such an algorithm is incorporated into the ALIGN program (version 2.0), which is part of the GCG sequence alignment software package.
  • ALIGN program version 2.0
  • Alignment may also be performed by manual inspection.
  • the present invention comprises polynucleotides and proteins conferring herbicide resistance. It is understood that when reference is made to a herbicide-resistant polynucleotide it means a polynucleotide encoding a herbicide-resistant AHAS protein. Herbicide-resistant AHAS proteins may be natural or mutant and they confer resistance to herbicides belonging to the group of imidazolinones or sulfonylureas.
  • the F2 plants thus obtained were sprayed with imazethapyr (Pivot®, BASF) at a rate of 3 ⁇ , 20 days in stage V6 after emergence and phenotypic symptoms were assessed 10 days after treatment.
  • the results are provided in Table 3.
  • Phenotype Phenotypic rating Amount of F2 progeny No damage 1 50 Chlorotic 2 84 Death 3 43 177
  • the results show that the F2 plant population could be classified based on visual symptoms according to a phenotype scoring that allowed for grouping individuals into three phenotypic categories: plants with no damage, chlorotic plants and dead plants.
  • nucleotide sequence set forth in SEQ ID No. 1 shows that nucleotide G is changed to A at nucleotide position +277 (corresponding to codon 93) which distinguishes the sorghum original endogamic line 80237 (susceptible to herbicides) from the induced ADV-IMI-R mutant of the invention.
  • This molecular marker was designated SNP-SbAHAS.
  • FIG. 3 shows as an example the allelic discrimination of some plants from the F2 population. The two tested controls were grouped in the expected clusters (ADV-IMI-R mutant and wild-type 90523, homozygous resistant and homozygous susceptible, respectively).
  • herbicide-resistant plants for example to herbicides belonging to the group of imidazolinones and/or sulfonylureas, e.g., imazethapyr, imazapic, or the like.
  • the identification method may be, in addition to the method described herein, any other known method, see for example ASA (Soleimani et al., (2003) Plant Mol Biol Rep 21: 281-288), PAMSA (Gaudet et al., (2007) Plant Mol Biol Rep 25: 1-9), SSCP (Germano and Klein (1999) Theor Appl Genet 99: 37-49) or TaqMan® (Jones et al., (2008) Pest Management Science 64: 12-15).
  • ASA Soleimani et al., (2003) Plant Mol Biol Rep 21: 281-288
  • PAMSA Gadet et al., (2007) Plant Mol Biol Rep 25: 1-9
  • SSCP Germano and Klein (1999) Theor Appl Genet 99: 37-49
  • TaqMan® Japanese Management Science 64: 12-15.
  • a fingerprinting (genotyped) procedure based on this information was carried out for the mutated ADV-IMI-R line of the invention and endogamic 90253 line using various SSRs-type DNA molecular markers.
  • Seven polymorphic SSRs located in chromosome 4 were selected for genotyping (Mace, E S et al., A consensus genetic map of sorghum that integrates multiple component maps and high - throughput Diversity Array Technology ( DArT ) markers, BMC Plant Biology, 2009, 9: 13; Srinivas, G et al., Exploration and mapping of microsatellite markers from subtracted drought stress ESTs in Sorghum bicolor (L.), Moench. Theor. Appl. Genet.
  • the polynucleotide of the invention may be introduced in plants for obtaining transgenic plants.
  • a polynucleotide in plants, particularly in plants of agronomic interest, e.g., corn, soybean, sorghum, wheat, sugarcane, flax, sunflower or other plants; vegetables, trees, or ornamental plants.
  • Methods for introducing polynucleotides to obtain transgenic plants are well-known in the art, and recombinant methods may also be used.
  • the vector may also be introduced using ballistic particle acceleration techniques such as described in U.S. Pat. No. 4,945,050 and Casas el. al., Proc. Natl. Sci., USA, 90: 11212, 1993
  • Plants transformed, for example, with the polynucleotide of the invention express herbicide-resistant AHAS proteins and exhibit resistance traits to herbicides such as imidazolinones and/or sulfonylureas.
  • herbicide-resistant AHAS proteins are meant proteins exhibiting an AHAS activity which is higher than that of wild-type AHAS activity when in the presence of a herbicide interfering with AHAS activity at concentrations at which the herbicide interferes with AHAS activity of the wild-type AHAS protein.
  • the polynucleotide sequence of the invention may be included in an expression cassette for expressing the resistant AHAS protein in a plant of interest, for example of agronomic interest.
  • the cassette comprises a regulatory sequence operably linked, e.g., to at least one promoter. Promoters are well known in the art, and may be, e.g., constitutive, inducible, tissue-specific, chloroplast-specific promoters, all of them being functional in plants.
  • the cassette further comprises transcriptional termination sequences known in the art.
  • the cassette may comprise various regulatory sequences in order to improve expression efficiency of the herbicide-resistant AHAS polynucleotide, for example enhancers such as introns, viral sequences or the like; or may comprise other polynucleotide sequences of interest different from the polynucleotide of the invention, bound or not to said polynucleotide; or leader sequences.
  • enhancers such as introns, viral sequences or the like
  • Promoters include, but are not limited to, constitutive, inducible, tissue- or organelle-specific promoters, such as the 35S promoter, a wound- or chemical-inducible promoter, a heat shock promoter, a tetracycline-inducible promoter or the like (Chao et. al. 1999, Plant Physiol., 120: 979; U.S. Pat. Nos. 5,187,267, 5,057,422.
  • transcription terminators which may be of use in plants, see, e.g., Odell, et al., 1985, Nature 313: 810; Sanfacon, et. al., Genes Dev., 5: 141, 1990; Munroe, et al., 1990 Gene 91: 151; Rosenberg et al., 1987, Gene 56: 125; Joshi, et al., Nucleic Acid Res., 15: 9627, 1987.
  • operably linked is intended to refer to a functional linkage between a promoter and a second sequence.
  • the promoter sequence initiates and mediates transcription of the DNA sequence corresponding to the second sequence.
  • operably linked means that the nucleic acid sequences being linked are contiguous and, where necessary to join two protein coding regions, contiguous and in the same reading frame.
  • the cassette may be a multiple expression cassettes.
  • the polynucleotide of the invention may be attached to other polynucleotides in the form of a fusion of polynucleotides or separately.
  • the other polynucleotide(s) may encode, e.g., herbicide-resistant, insect-resistant or other plant parts which are well-known by those skilled in the art.
  • the polynucleotide of the invention may be modified, for example by including plant-preferred codons, deleting sequences such as introns or deleterious sequences.
  • a polynucleotide encoding the resistant AHAS polypeptide of the invention which has been mutated, and exhibits, e.g., deletions or insertions or other mutations different from the one described herein.
  • mutated polynucleotide is meant a polynucleotide having permanent changes in its nucleotide sequence.
  • the polynucleotide of the invention may be altered by substitutions, deletions, truncations, and insertions. Methods for such manipulations are generally known in the art. Methods for mutagenesis and nucleotide sequence alterations are well known in the art (Kunkel (1985) Proc. Natl. Acad. Sci., USA 82: 488-492; Kunkel et al., (1987) Methods in Enzymol., 154: 367-382; Walker and Gaastra, eds., (1983) Techniques in Molecular Biology (MacMillan Publishing Company, New York) and the references cited therein.
  • the DNA comprising the AHAS polynucleotide of the invention may be introduced in different plants as part of a vector.
  • the choice of a suitable vector depends on the method intended to be used for the transformation and the plant to be transformed. Those skilled in the art are well aware of different vectors, e.g., Ti and/or Ri. T-DNA is also used as flanking regions for integrating Ti or Ri vectors (WO 84/02913, Herrera-Estrella et al., 1983, Nature 303: 209; Horsch et al., 1984, Science 223: 496; Fraley et. al., 1983, Proc. Natl. Acad. Sci, USA 80: 4803.
  • the vector may comprise an expression cassette and other nucleotide sequences, for example selectable markers such as markers conferring resistance to antibiotics or herbicides and sequences for driving the expression of polynucleotide(s) of interest in plants, e.g., the AHAS large subunit polypeptide of SEQ ID No. 2.
  • a vector comprising a polynucleotide encoding the resistant AHAS polypeptide of the invention may be useful for obtaining a transgenic plant which is resistant to herbicides of the type of imidazolinones and sulfonylureas.
  • the transformed plants may be any type of plants such as dicots and monocots, among which are, without limitation, plants of agronomic interest such as sorghum ( Sorghum bicolor, Sorghum vulgare ), maize ( Zea mays ), Brassica sp. (e.g., B. napus, B. rapa, B.
  • ADV-IMI-R 80237EMS2-192
  • the generational history is shown in Table 5.
  • Sorghum line 80237 Advanced breeding line
  • imidazolinone-resistant ADV-IMI-R mutant of the present invention original mutation
  • three herbicides from the group of imidazolinones imazethapyr, imazapyr, and imazapic.
  • Four different rates were assayed for each of the herbicides: 1 ⁇ , 2 ⁇ , 3 ⁇ , and 4 ⁇ (being 1 ⁇ the recommended application rate) (see Table 1 above):
  • DM dry matter
  • DM ij % Control ( DM ij *100) /DM Control DM ij % Control is the mean value of 3 experiments for each treatment from each line.
  • Sequencing studies were made on leaf tissue from ADV-IMI-R mutant (VT11-11331-BK selection) and wild-type endogamic line 80237. Genomic DNA was isolated and resuspended in water at a final concentration of 100 ng/ ⁇ l. Sequencing of the acetohydroxyacid synthase (AHAS) gene from ADV-IMI-R mutant and from sorghum line 80237, specific primers were designed for amplification by the polymerase chain reaction (PCR) based on the sorghum AHAS sequence disclosed in GenBank under Access No. GM663363.1. The primers were designed so as to generate 5 overlapping DNA segments (amplicons) representing the complete AHAS coding sequence. Sequences of designed primers are:
  • the PCR mixture had a final volume of 25 ⁇ l and the following components: 1 ⁇ reaction buffer (Invitrogen) 0.2 mM dNTPs (GE Healthcare), 2.5 mM MgCl 2 (Invitrogen), 0.2 ⁇ M of each primer, 0.5 ⁇ l Platinum Taq (5 U/ ⁇ l) (Invitrogen) and 100 ng of genomic DNA.
  • the PCR reaction was performed in a GeneAmp PCR System 9700 thermocycler (Perkin-Elmer) and amplification conditions were as follows: a step of initial denaturation at 94° C. for 1 minute followed by 35 cycles at 94° C. for 45 seconds, 57° C. for 45 seconds, and 72° C. for 70 seconds, and a final elongation step at 72° C. for 10 minutes.
  • a targeted crossing was carried out between sorghum line 90523 (Advanta proprietary elite line, susceptible to imidazolinones) and the imidazolinone-resistant ADV-IMI-R mutant (VT09-9754-48-6-BK selection).
  • the resulting F1 plants were auto-pollinated and F2 seeds were harvested.
  • the F2 seeds were planted in the field in Venado Tuerto, in October 2010.
  • the F2 plants (177 plants) were sprayed with imazethapyr (Pivot®, BASF) at a rate of 3 ⁇ (where 1 ⁇ is the rate recommended by the manufacturer for commercial use which is equivalent to 100 ml a.i./ha).
  • leaf tissue from each of the 177 F2 plants from both ADV-IMI-R mutant (VT09-9754-48-6-BK selection) and wild-type line 90523 were collected to isolate genomic DNA, which was resuspended in water at a final concentration of 100 ng/ ⁇ l for use in genotypic analysis.
  • Herbicide was sprayed 20 days after emergence (stage V6). The plants were assessed ten days after spraying, and the herbicidal effect was classified into three categories by visually assessed symptoms according to the following phenotypic scoring:
  • a single point mutation in the AHAS gene replacing nucleotides G by A at nucleotide position +277 (codon 93) distinguishes the original endogamic sorghum line 80237 (herbicide-susceptible) from the induced ADV-IMI-R mutant.
  • a molecular marker (designated herein as SNP-SbAHAS) was designed using the following group of dual labeled primers and probes:
  • Genotyping was performed by a real time PCR allelic discrimination assay using an AB 7500 thermocycler (Applied Biosystems, Foster City, Calif., US).
  • a PCR reaction mix was prepared in a final volume of 25 ⁇ l comprising: 12.5 ⁇ l 2 ⁇ Perfecta® qPCR Supermix (Quanta Biosciences, Gaithersburg, Md., US), 0.08 ⁇ M primers (forward and reverse), 0.4 ⁇ M probes (1 and 2), 10 ⁇ l genomic DNA and DNase-free water to make up the final volume.
  • Amplification conditions one initial denaturation cycle at 95° C. for 10 min, followed by 50 denaturation cycles at 92° C. for 15 seconds and hybridization/extension at 60° C. for 1 min.
  • the results of the allelic discrimination assay were analyzed after amplification using the AB Sequence Detection System (SDS) 7500 1.4 software program (Applied Biosystems, Foster City, Calif., US).
  • SDS AB Sequence Detecti
  • Herbicide-resistance and the specific SNP-SbAHAS marker were genetically mapped. Based on the sorghum AHAS sequence disclosed in GenBank (Access No. GM663363.1, a BLAST analysis was carried out matching it with Sorghum bicolor genomic DNA sequences deposited in the Phytozome database (http://www.phytozome.net/search.php).
  • Genotyping (fingerprinting) of the mutated ADV-IMI-R line and the endogamic line 90253 was carried out using a group of SSR-type molecular markers. Seven polymorphic SSRs located in chromosome 4 of Sorghum bicolor genome were selected for genotyping (Mace, E S et al., A consensus genetic map of sorghum that integrates multiple component maps and high - throughput Diversity Array Technology ( DArT ) markers, BMC Plant Biology, 2009, 9: 13; Srinivas, G et al., Exploration and mapping of microsatellite markers from subtracted drought stress ESTs in Sorghum bicolor (L.), Moench. Theor. Appl. Genet.
  • the 7 selected polymorphic SSRs were: SSR in chromosome 4 Forward primer Reverse primer Xtxp12 AGATCTGGCGGCAACG AGTCACCCATCGATCATC (SEQ ID No. 21) (SEQ ID No. 22) Xtxp177 GCCGGTTGTGACTTG TTAAAGCGATGGGTGTAG (SEQ ID No. 23) (SEQ ID No. 24) Xtxp343 CGATTGGACATAAGTGTTC TATAAACATCAGCAGAGGTG (SEQ ID No. 25) (SEQ ID No. 26) Dsenhsbm39 TCAGTGATACAGCCGTCCAG ATGCATAAACCACGGCTGTC (SEQ ID No. 27) (SEQ ID No.
  • the resulting PCR fragments from each of the tested SSRs were resolved by capillary electrophoresis using an automated sequencer ABI3130xl (Applied Biosystems). Genotyping of these 7 SSRs was carried out in 177 individuals of the F2 progeny resulting from the ADV-IMI-R ⁇ 90523 crossing. In addition, these same 177 F2 progeny plants were analyzed as to the presence of the SNP-SbAHAS marker specific for the induced mutation in the AHAS gene.

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